How to create a custom video filter moving with my face - hat, nose etc?

I've already created a custom video filter to display an image at a fixed position on the screen, e.g. for a company logo.

Now I'd like to create a custom video filter where the graphics move with my face, to give me e.g. a clown's nose or a sorcerer's hat. Basically like the preconfigured filters (e.g. 'Head Chef', 'Bunny rabbit', 'Daisy'), just with my own graphics.

I've tried to just drag my new nose graphics in the middle of the head symbol in the dialog to create the filter - but it's just stuck in the middle of the screen, and doesn't move around with my face. How can I do that?